arch/arm64/include/asm/semihost.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2012 ARM Ltd.
   4  * Author: Marc Zyngier <[email protected]>
   5  *
   6  * Adapted for ARM and earlycon:
   7  * Copyright (C) 2014 Linaro Ltd.
   8  * Author: Rob Herring <[email protected]>
   9  */
  10
  11 #ifndef _ARM64_SEMIHOST_H_
  12 #define _ARM64_SEMIHOST_H_
  13
  14 struct uart_port;
  15
  16 static inline void smh_putc(struct uart_port *port, unsigned char c)
  17 {
  18         asm volatile("mov  x1, %0\n"
  19                      "mov  x0, #3\n"
  20                      "hlt  0xf000\n"
  21                      : : "r" (&c) : "x0", "x1", "memory");
  22 }
  23
  24 #endif /* _ARM64_SEMIHOST_H_ */